var uniquepageid=window.location.href.replace("http://"+window.location.hostname, "").replace(/^\//, "");

function animatedcollapse(divId, animatetime, persistexpand, initstate){
	this.divId=divId;
	this.divObj=document.getElementById(divId);
	this.divObj.style.overflow="hidden";
	this.timelength=animatetime;
	this.initstate=(typeof initstate!="undefined" && initstate=="block")? "block" : "contract";
	this.isExpanded=animatedcollapse.getCookie(uniquepageid+"-"+divId);
	this.contentheight=parseInt(this.divObj.style.height);
	var thisobj=this;
	if (isNaN(this.contentheight)){ 
		animatedcollapse.dotask(window, function(){thisobj._getheight(persistexpand)}, "load");
		if (!persistexpand && this.initstate=="contract" || persistexpand && this.isExpanded!="yes" && this.isExpanded!="") 
			this.divObj.style.visibility="hidden";
	}
	else if (!persistexpand && this.initstate=="contract" || persistexpand && this.isExpanded!="yes" && this.isExpanded!="")
		this.divObj.style.height=0;
	if (persistexpand)
		animatedcollapse.dotask(window, function(){animatedcollapse.setCookie(uniquepageid+"-"+thisobj.divId, thisobj.isExpanded)}, "unload");
}

animatedcollapse.prototype._getheight=function(persistexpand){
	this.contentheight=this.divObj.offsetHeight;
	if (!persistexpand && this.initstate=="contract" || persistexpand && this.isExpanded!="yes"){
		this.divObj.style.height=0;
		this.divObj.style.visibility="visible";
	}
	else 	
		this.divObj.style.height=this.contentheight+"px";
}

animatedcollapse.prototype._slideengine=function(direction){
	var elapsed=new Date().getTime()-this.startTime;
	var thisobj=this;
	if (elapsed<this.timelength){
		var distancepercent=(direction=="down")? animatedcollapse.curveincrement(elapsed/this.timelength) : 1-animatedcollapse.curveincrement(elapsed/this.timelength);
	  this.divObj.style.height=distancepercent * this.contentheight +"px";
	  this.runtimer=setTimeout(function(){thisobj._slideengine(direction)}, 10);
	}
	else{
		this.divObj.style.height=(direction=="down")? this.contentheight+"px" : 0;
		this.isExpanded=(direction=="down")? "yes" : "no";
		this.runtimer=null;
	}
}


animatedcollapse.prototype.slidedown=function(){
	if (typeof this.runtimer=="undefined" || this.runtimer==null){
		if (isNaN(this.contentheight))
			alert("Please wait until document has fully loaded then click again");
		else if (parseInt(this.divObj.style.height)==0){
			this.startTime=new Date().getTime();
			this._slideengine("down");
		}
	}
}

animatedcollapse.prototype.slideup=function(){
	if (typeof this.runtimer=="undefined" || this.runtimer==null){
		if (isNaN(this.contentheight))
			alert("Please wait until document has fully loaded then click again");
		else if (parseInt(this.divObj.style.height)==this.contentheight){
			this.startTime=new Date().getTime();
			this._slideengine("up");
		}
	}
}

animatedcollapse.prototype.slideit=function(){
	if (isNaN(this.contentheight))
		alert("Please wait until document has fully loaded then click again");
	else if (parseInt(this.divObj.style.height)==0)
		this.slidedown();
	else if (parseInt(this.divObj.style.height)==this.contentheight)
		this.slideup();
}

animatedcollapse.curveincrement=function(percent){
	return (1-Math.cos(percent*Math.PI)) / 2;
}

animatedcollapse.dotask=function(target, functionref, tasktype){ 
	var tasktype=(window.addEventListener)? tasktype : "on"+tasktype;
	if (target.addEventListener)
		target.addEventListener(tasktype, functionref, false);
	else if (target.attachEvent)
		target.attachEvent(tasktype, functionref);
}

animatedcollapse.getCookie=function(Name){ 
	var re=new RegExp(Name+"=[^;]+", "i");
	if (document.cookie.match(re))
		return document.cookie.match(re)[0].split("=")[1];
	return "";
}

animatedcollapse.setCookie=function(name, value){
  document.cookie = name+"="+value;
}
